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I just went through all sites and noted down the Tx freqs of everything registered to victrack between 686-510 meg.All the rail stuff is a bit lower frequency I've found.Got a handful of frequencies (13 extras to be precise), plugged them into a new system in the scanner and started listening.It was immediately obvious that at least 3 of those were control channels / data. So I avoided them.I've left the others in, we shall see if I get any action.

Unless things have changed since my last visit to Melbourne the tram network is a conventional voting system, not trunking. The data is not control channel but AVL (Automatic Vehicle Location also referred to Autonomous Vehicle Location). As the name suggests it transmits data back to control so they know the location of each vehicle.

In some systems I have seen while travelling on trams overseas the receivers were located on street lamp posts located a few hundred metres apart. The transmitters were location at the top of the tram and were using a few hundred milliwatts.